JP3813171B2 - Method for producing bristle product by injection molding method and bristle product produced by this method - Google Patents

Method for producing bristle product by injection molding method and bristle product produced by this method Download PDF

Info

Publication number
JP3813171B2
JP3813171B2 JP52862095A JP52862095A JP3813171B2 JP 3813171 B2 JP3813171 B2 JP 3813171B2 JP 52862095 A JP52862095 A JP 52862095A JP 52862095 A JP52862095 A JP 52862095A JP 3813171 B2 JP3813171 B2 JP 3813171B2
Authority
JP
Japan
Prior art keywords
bristle
passage
bristle bundle
bundle
distance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP52862095A
Other languages
Japanese (ja)
Other versions
JPH09512724A (en
Inventor
ヴァイラウフ ゲオルク
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Coronet Werke GmbH
Original Assignee
Coronet Werke GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6517382&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=JP3813171(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Coronet Werke GmbH filed Critical Coronet Werke GmbH
Publication of JPH09512724A publication Critical patent/JPH09512724A/en
Application granted granted Critical
Publication of JP3813171B2 publication Critical patent/JP3813171B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D3/00—Preparing, i.e. Manufacturing brush bodies
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B3/00—Brushes characterised by the way in which the bristles are fixed or joined in or on the brush body or carrier
    • A46B3/04—Brushes characterised by the way in which the bristles are fixed or joined in or on the brush body or carrier by mouldable materials, e.g. metals, cellulose derivatives, plastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14336—Coating a portion of the article, e.g. the edge of the article
    • B29C45/14385—Coating a portion of a bundle of inserts, e.g. making brushes

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Brushes (AREA)
  • Pens And Brushes (AREA)
  • Artificial Filaments (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

PCT No. PCT/EP95/01408 Sec. 371 Date Aug. 30, 1996 Sec. 102(e) Date Aug. 30, 1996 PCT Filed Apr. 14, 1995 PCT Pub. No. WO95/30350 PCT Pub. Date Nov. 16, 1995The invention is a process for the production of brushware having a plastic bristle carrier and at least one bristle bundle fixed to the carrier and constituted of stretched, stabilized plastic monofilaments. An open injection mould is provided defining a cavity in which the bristle carrier is moulded with one part of the mould having a channel in which at least one bristle bundle is guided with an end of each bristle bundle projecting beyond a mouth of the channel and being melted to a thickening having a cross section greater than a cross section of the channel and the bundle which anchors the bundle to the carrier with the thickening being spaced a distance from the mouth of the channel. The injection mould is closed to define the cavity and a plastic melt is injected into the cavity with the distance of the thickening of the at least one bristle bundle from the mouth of the channel permitting air and any degassing products from the plastic melt to be removed through the channel and being of sufficient length so that a length of thermally weakened monofilaments produced by a molecular reorientation during melting of the end of the at least one bristle bundle to form the thickening area surrounded by the plastic melt without the plastic melt penetrating the channel. The at least one bundle is positioned and fixed in the channel so that the distance, depending upon a diameter of the monofilaments, is between 0.1 mm and 2.O mm.

Description

本発明は請求項１の上位概念による方法並びに請求項１０の上位概念による剛毛製品に関する。
剛毛製品の剛毛にも剛毛支持体にもプラスティックが使用されるようになって以来、従来の剛毛支持体への剛毛束の機能的な固定を別の機能的な固定手段を使用しない形状結合または素材結合に代えようという試みがなされてきた。それには特に、剛毛束端部の周囲に剛毛支持体用のプラスティック融液を射出して埋設し、剛毛支持体に固定するいわゆる射出が挙げられる。
剛毛製品の重要な品質特性は、個々の剛毛ないしは剛毛束の引抜き強度である、すなわち剛毛は使用時に作用する力の下で分離しないように剛毛支持体のプラスティック材料内に埋設されなければならない。したがって公知の射出成形法の中の、射出成形用金型内に置かれた剛毛束端部に厚肉部が設けられ、この厚肉部が剛毛支持体のプラスティック材料での周囲への射出の後に一種のアンカーを形成し、さらには剛毛をそれらの固定側端部で互いに結合し、その結果剛毛束にまたはまた個別の剛毛のみにも作用する引抜き力が厚肉部内へ導かれ、剛毛支持体内における厚肉部の固定（Einspannung）によって吸収されるようなものしか有用ではないと証明された。
公知の方法はすべての射出成形用金型を使用し、一方の金型半部には剛毛移植部に相当する数の通路が設けられており、通路内を剛毛束をその端部が金型キャビティ内へ入り込むまで供給することができる。次いで剛毛束の剛毛端部が厚肉部を形成する接着剤によって互いに結合されるか（フランス国特許１４５３８２９号／Piotrowski）、または剛毛がプラスティックモノフィラメント製である場合には溶融せしめられ、融液が硬化して剛毛束よりも大きな横断面を有する厚肉部となる（ドイツ国８４５９３３／Schiffer）。
剛毛の引抜き強度は、剛毛束の剛毛支持体内での埋設長さが大きければ大きい程大きくなることは明らかである。しかしこれは次の要求に反する：普通高価なプラスティック、例えばポリアミドから製作される剛毛でもまた剛毛支持体でも材料の使用量をできる限り僅かに保持しなければならず、このことは剛毛の相応して短い固定によって実現される。さらに剛毛支持体が使用上の理由から肉厚ができる限り僅かでなければならない剛毛製品がある。これは例えば、口腔内の狭い状況のために剛毛の長さも含めてできる限り短い構成を保証するために歯ブラシに該当する。
剛毛の固定長さの最小化は、公知の方法において、剛毛端部の溶融によって得られた肉厚部を、剛毛支持体のプラスティック融液を剛毛束を導く通路の開口へ射出する際の射出圧力によって押しのけ、このようにして固定長さを実際に厚肉部の厚さに減少させ、かつ剛毛束の固着を専ら厚肉部と金型の壁との間に侵入した剛毛支持体のプラスティック材料によって達成することによって得られる（ヨーロッパ特許０１４２８８５／Anchor）。この公知の方法では同時に、通路を肉厚部でシールして射出されたプラスティック融液が剛毛束の縁に沿ってまたは剛毛間へ流れ出て（射出成形材料流れUeberspritzen）、仕上げブラシにばりができるかまたは少なくとも美観を損ねるのを阻止するという目的が追求されている。これによって剛毛支持体への取付け領域における剛毛の曲げ挙動も不規則な形で影響されよう。しかしこの方法は多くの理由から不十分である。第１に剛毛束通路への肉厚部の押圧が確実ではなく、かつ再生可能には保証され得ない。すなわち金型内における射出成形材料の案内により、厚肉部の横断面、特にその長さが剛毛束の直径よりも突出することにより、厚肉部も融液内に浮遊する、すなわち剛毛束が一部分通路から融液内へ引込まれることがあり、そのためにシール効果も得られず、かつ剛毛支持体の外部において均一な使用長さも得られない。剛毛束の引抜き強度も十分ではない、それというのも厚肉部上へ覆う薄い材料ウエブは中程度の剪断強さを有するにすぎないからである。
この方法の欠点は他の公知の方法によって、すなわち厚肉部の形成後厚肉部をして通路の開口に対してシールするように張力を剛毛束に作用させることによって一部は解消された（ヨーロッパ特許０３２６６３４／Coronet）。このようにしてできる限り短く、かつすべての剛毛束に関して同一の埋設長が得られ、かついわゆる射出成形材料流れ（プラスティック材料の通路内並びに剛毛束間、また剛毛束外周部への侵入）は起らない。しかし厚肉部の固定における中程度の剪断強さはそのままである。
もう１つの公知の方法では（ドイツ国１０５０３０４／Beck）では射出成形材料流れが、剛毛製品の移植部の剛毛すべてがまとめられて唯一のパックとされ、かつ固定側の端部にプレートが一体成形され、プレートの縁のみが剛毛支持体のプラスティック材料によって下から係合されることによって回避される。この構成は、複数の小さな剛毛束の作用に重要性が置かれていない刷毛、絵筆または類似のものでは有利であろう。すなわちこの方法は特別な剛毛製品に限定される。さらにこの場合も固着の目的に使用できる横断面はきわめて小さく、したがってその剪断強さは通常のストレスに対して十分ではない。
最良の結果が期待できる公知の方法（ヨーロッパ特許０１４２８８５およびヨーロッパ特許０３２６６３４）では、これによって製作された剛毛製品、特に歯ブラシが記述の欠点の他に他の予期しない品質の欠陥を持つことが示された。すなわち遅くとも一定期間使用後には剛毛束の拡開および剛毛の回復力の著しい劣化が生じ、すなわち個別の剛毛の曲げ強さがこの方法では明らかに低下せしめられ、これは埋設長のより大きい構成では認められない。しかしこの場合には（ドイツ国８４５９９３、フランス国１４５３８８２９）、不都合な、高い材料使用量の他に他の不利な効果が生じる。例えば場合により離型後剛毛束が互いに平行ではないか、ないしは剛毛支持体の固定側表面に対して垂直ではなく、所定位置に対して傾いているか、または剛毛が埋設された領域内で曲っていることが示された。
使用上有利であるより大きな埋設長では射出成形材料流れとこれによって起るばり形成が回避されなければならない。そのためにこの方法でも既にシール手段が提案されており、例えば通路内にある剛毛束内にマンドレルを駆動して通路内で剛毛を密に押圧する（ドイツ国３８３２５２０／Schiffer）。他の方法（ドイツ国２９２２８７７／Zahoransky）では通路を金型のキャビティ側で狭め、剛毛束をこの部分内へ押込む。その上に通路は外部から圧縮空気でもって負荷される。
付加的なシール手段を備えた公知のすべての方法においてこれらが所望の大きな固定長を与えたとしても製品には依然として品質の欠陥が認められる。剛毛支持体表面の剛毛束の取付け領域内には射出成形材料流れと、特に材料ピーク、裂目および凹所そしてこれらから生じるばりおよび縁の形の不平ら性が示された。断面では場合により空洞が示された。これらの表面の欠陥は特に歯ブラシ（粘膜を傷つける可能性のために）、またボディブラシでは不都合である。この欠点を持つ歯ブラシまたはボディブラシは衛生的な要求をも満足しない、それというのも不所望な沈着が、特にバクテリアの生育および増殖が起るからである。最後にこれによりまた引抜き強度が損われる。
本発明の課題は、請求項１の上位概念による方法を、できる限り僅かな材料使用量で剛毛束またはまた個々の剛毛の十分な引抜き強度が達成され、剛毛の曲げ弾性および回復能力が維持され、かつ剛毛支持体の取付け領域内で申し分のない表面が得られるように改良することである。さらにこれらの要求を満たす剛毛製品が提供されなければならない。
本発明は、モノフィラメントの延伸および熱による安定化によって得られた剛毛の曲げ強度と曲げ弾性（回復能力）が厚肉部の形成のための剛毛端部の溶融によって損われるという公知の知識から出発する。厚肉部に直近の剛毛の取付け領域内において分子の再配向が、ひいてはこの領域内で個々の剛毛の曲げ挙動の劣悪化、同様に引張り強度の低下が起る。前者は、通路に対して厚肉部でのシールを行う公知の方法では剛毛束の膨張を招く。本発明による方法によって、できる限り少ない剛毛および剛毛支持体の材料使用量でもって剛毛の熱により弱体化した領域が埋設され、したがって剛毛の、剛毛支持体外部の露出部分は延伸および熱的な安定化によって得た性質を完全に維持する。弱体化された領域が固定されるので、個々の剛毛の引抜き強度は改善される。
剛毛束の溶融によって熱によって損われる長さは複数の要因、特に溶融温度の高さおよび熱の作用時間、プラスティックおよびモノフィラメントの種類に依存する。実際に損傷を受ける長さは、剛毛束端部の溶融およびいくつかの交番応力による予備テストで個別の剛毛束で問題なく確認することができ、したがって射出成形法で製造される製品について所要の埋設長さを確認することができる。
上記のように剛毛の熱的な損傷についての知識は他の関連で、すなわち剛毛と剛毛支持体との溶接においてではあるが公知である（ドイツ国実用新案９２０６９９０／Bickel）。これは、ブラシ体の剛毛側に凹所を設けるという複雑な構造のブラシで配慮されている。剛毛は薄いプラスティックプレート上へ溶接される。プラスティックプレートは凹所内へ挿入され、剛毛束を通す多孔プレートによって覆われる。剛毛束はプレートの孔内で側方で支持される。
最後の多孔プレートと剛毛束プレートをブラシ体で支えるためには別個の部材が必要である。このようなブラシは許容可能なコストで製造できないし、また縁および間隙のために歯ブラシまたはボディブラシでは生理的および衛生的な要求に応じられない。これはまた個々の剛毛の引抜き強度の問題を解決することができない。
本発明による方法では熱的に損傷を受けた領域は専ら剛毛支持体のプラスティックで包囲することによって埋設される。剛毛束の埋設長は厚肉部の通路開口からの距離によって規定される。しかしこの距離は本発明によればもう１つの条件を満たさなければならない；すなわちこの距離は少なくとも、射出過程でキャビティ内で押しのけられた空気（これは有利には凹所、間隙など、したがって有利には剛毛束の厚肉部の後方にも移動して行く）が通路を通って場合により剛毛間にも入って行くことができるような大きさでなければならない、なぜならば空気は公知の方法で観測された束取付け部における空洞、空所等に関係があるようだからである。同じことが融液の、場合による脱ガス生成物に関して該当する（“Kunststoff-Lexikon”第６版、Carl Hanser Verlag）。本発明による方法ではまたこの欠点も排除される。他方で厚肉部と通路開口との距離は、射出成形材料流れが起きる程大きくてはならない。本発明によって可能な最小の距離を測定するための重要なパラメータが決められる、すなわち剛毛の熱的に弱められた長さ領域の埋設、空洞、空隙等を回避し、かつ射出成形材料流れを回避することによる剛毛支持体における平滑な表面を達成するために埋設領域における金型の申し分のない排気の配慮。この場合本発明によって特に、最近の射出成形技術で要求される剛毛束通路のシールが不要となることが認められた。
普通の剛毛製品では、本発明によって記載されたパラメータが、厚肉部と通路開口との距離が剛毛の直径の２倍から５倍になるように剛毛束が通路内に位置決めされ、かつ固定される場合に維持されることが実地での試験によって示された。これは数値的には、剛毛直径０．３ｍｍまででは距離０．１〜１．０ｍｍ、有利には０．４ｍｍまで、より大きい直径では０．５〜２．０ｍｍ、有利には１．５ｍｍまでに設定されるように規定することができる。
一方で金型の排気を保証し、かつ他方で射出成形材料流れを回避するためには実施形によれば、１つの剛毛束の剛毛の横断面の計が剛毛束を案内する通路の横断面の５０〜７５％である剛毛束が使用される。
この構成では一方で剛毛間の、および他方で剛毛と通路壁との間の毛管が十分に大きく、特に厚肉部に存在するアンダーカットの領域内で金型の申し分のない排気を可能にし、また他方では、プラスティック融液（プラスティック融液は適切な技術的手段（射出成形用金型の冷却のガイドと制御、剛毛束通路の領域における材料の選択、射出速度と圧力等の案内）によって剛毛束取付け領域でできる限り迅速に硬化せしめられる）の剛毛毛管内ないしは通路内への侵入を阻止するほど十分に狭い。
本発明により維持すべきパラメータは、他の実地上の量によって決めることができる、すなわち剛毛束を通路内に、厚肉部と通路開口との間の距離を通路の直径の２０〜５０％の範囲内に置き、この場合上記の実施形で挙げられた通路の充填度も実現されなければならない。
方法を実際に実施する際には、剛毛束を通路内へ、その端部が通路開口から距離“Ａ”の所に位置するまで挿入し、引続き溶融して長さ“Ｌ”＜“Ａ”にする。その結果厚肉部は通路の開口から距離“Ｂ”にあり、かつ剛毛束は引続き通路内へ、厚肉部が通路の開口から所望の距離“Ｃ”＜“Ｂ”に達するまで引き戻される。
この方法でもって所望のできる限り小さな距離を特に簡単かつ正確に調整することができる。原則的に、剛毛束を案内する通路を直接射出成形用金型の半部の１つ内に設け、かつ射出成形用金型を開けて厚肉部を剛毛束端部に形成することが可能である。しかし有利には、射出成形用金型の外部で、通路を備えた保持部材内の剛毛束が端部で溶融せしめられて厚肉部とされ、かつ位置決めされ、引続き保持部材が位置決めされた剛毛束と一緒に金型半部の補完下に射出成形用金型へ密封結合せしめられるように行われる。この方法は、剛毛束での準備作業が持続的な操作で加熱される射出成形用金型においてではなく、この金型の外部で行われる利点を有している。第１に射出成形用金型の放射による剛毛の損傷が回避され、他方で剛毛束端部および保持部材の領域内におけるプラスティック融液の迅速な硬化が配慮され、したがって射出成形材料流れが阻止される。
この方法はさらに、保持部材をその射出成形用金型からのおよび該金型への搬送路上で、および場合により剛毛束を厚肉部形成後に冷却することによって最適化することができ、それにより剛毛束および保持部材を常に一定の低い、制御可能な温度に保持し、かつこの状態で射出成形用金型へ供給することができる。
本発明の課題は、冒頭に挙げられた方法において、剛毛束端部の溶融後これを形成する依然として軟−可塑性の物質を剛毛の方向に、該物質が剛毛間および剛毛束の周部に沿って移動せしめられ、かつ剛毛を少なくともモノフィラメント溶融時に分子の再配向によって熱的に弱められた長さ範囲の１部分において包囲するように変形することによっても解決することができる。
この方法では剛毛の弱体化された長さ範囲の少なくとも１部は直接依然として軟可塑性の厚肉部の変形により剛毛材料によって埋設され、かつ安定化される。これによって剛毛束と厚肉部の全埋設長はさらに最小にすることができる。
この方法はまた、モノフィラメントの溶融の際に分子の再配向によって弱体化されたモノフィラメントの長さ領域が１部は厚肉部の成形時に押しのけられた溶融モノフィラメントの物質によって、１部は射出された剛毛支持体のプラスティック融液によって包囲され、しかもプラスティック融液が通路内へ侵入しないような距離を厚肉部が厚肉部の形成および変形後に通路開口との間に有する程度に剛毛束を通路内へ挿入案内するように、変更することができる。
厚肉部の押しのけられた物質によって包囲された剛毛の部分長はこの方法では通路を介して所望の排気が剛毛束の領域内に与えられるか、ないしは射出成形材料流れが回避されるように設計されればよい。
金型キャビティの、特に剛毛束取付け部の領域における申し分のない排気、並びに射出成形材料流れの回避は別の実施形によれば、射出速度が射出開始時の最大値から射出成形用金型の完全な充填まで低下し、かつ通常適用された後圧力を当初の低い値からより高い価へと上げることによって支持される。
本発明の別の構成で配慮された手段は同様に作用し、すなわち通路を備えた金型半部が通路の開口領域内にこの通路に同心的な輪郭部を有しており、この輪郭部が厚肉部と通路開口との間の領域内でプラスティック融液の流路の延長によって流れ速度を遅らせ、かつこの領域内においてプラスティック融液の冷却を加速する。
剛毛束の領域内における流路の延長は構造的には、輪郭部が、通路を金型キャビティ内へ延長するカラーによって形成されることによって、または輪郭部が金型壁内の凹所によって形成され、かつ通路の開口が凹所の底部に存在することによって達成される。
本発明による方法によってトップクオリティの製品（特に歯ブラシも）を最小の不良品率で製作することができるのみならず、射出成形を使用することも可能であり、射出成形は周知のようにハンドルの一般的な表面性質に関してトップクオリティのブラシを与える。すなわち例えば歯ブラシをハンドルの端部の領域内で射出成形することができる、これは金型キャビティを申し分なく充填するためには通常高い射出圧力を必要とする。この高い射出圧力はまた金型キャビティ内に含まれた空気の相応する圧力増大をもたらすが、これはしかし本発明による厚肉部と通路開口縁との距離の調節によって完全に排除される。特に射出成形用金金型の分離面を介するものであれ、または付加的な排気通路を介するものであれ、他の排気手段を省略することができ、したがって射出成形用金型が密に閉鎖されるので分離面内にもバリは生じず、また剛毛支持体表面上に付加的な成形ポイントもない。
本発明の課題は、請求項１６の上位概念の特徴を有する剛毛製品において、厚肉部が剛毛支持体の束側の表面との間に、モノフィラメントの溶融時に熱的に弱体化された剛毛の長さ領域にほぼ相当する距離を有していることによって解決される。
以下本発明による方法の実施例が図面の参照下に詳説される。図１から図３は厚肉部製作を示し、図１ａ、図２ａ、図３ａは必要な装置の略示図、図１ｂ、図２ｂ、図３ｂは作業範囲の拡大図、図４は射出中の射出成形用金型の略示図、ブラシの離型時の略示図、図６および図７は厚肉部を製作するための方法の変更形を示し、図６ａ、図７ａは必要な装置部分を示す図、図６ｂ、図７ｂは作業範囲の各拡大図、図８から図１０は方法の別の変更形の略示図である。
図１ａから図３ａには剛毛束カセットの２つの相互間隙を置いて配置された多孔プレート１，２が示されており、これら多孔プレート間には矢印３によって示される方向に移動可能な締付けプレート４が配置されている。多孔プレート１，２および締付けプレートの孔の模様は製作される剛毛移植領域の剛毛束配置に相当する。
締付けプレート４を開いた状態で剛毛がショートカットとしてまたは無端のストランドからの束の形状でガイドプレート１，２および締付けプレート４の孔内へ、これが多孔プレート２から一定量突出するまで導入される。引続き剛毛束の突出端部の前に加熱装置６（図２ａ）が移動せしめられる。加熱装置は剛毛端部を無接触で加熱し、かつ溶融し、その結果厚肉部が形成される（図２ａ）。引続き締付けプレート４が開放位置へ移動され、かつ束が厚肉部７へ作用するスライダ８によって位置決めされ、次いで締付けプレートが図示されない閉鎖位置へ移動せしめられる。
図１ｂの拡大図で、剛毛束を供給する際に剛毛５が量“Ａ”だけ多孔プレートから突出することが判る。図２ａによる剛毛端部の溶融では剛毛は長さ“Ｌ”（図１ｂ）が溶融状態へ移行し、その結果このときに形成される厚肉部７は多孔プレート２から最小距離“Ｂ”を持つ。次いでスライダ８（図３ａ）を用いて厚肉部７が多孔プレート２の方向へ、これが多孔プレートの表面から所望の距離“Ｃ”（図３ｂ）を持つまで移動せしめられる。
このように固定された剛毛束は次に多孔プレート１，２および締付けプレート４によって形成されるカセットを用い、かつセンタリング部材９を用いて射出成形用金型１１の金型半部１０と結合される。カセットは金型半部１０の成形ネストを閉鎖する。第２の金型半部１２によって金型を閉鎖後射出ヘッド１３を用いて剛毛支持体用のプラスティック融液が射出される。プラスティック融液は金型キャビティ内へ突入した剛毛束端部、すなわち厚肉部７および剛毛の長さ“Ｃ”（図３ｂ）包囲する。押しのけられた空気は剛毛束通路を形成した多孔プレート２の孔を通ってにが、かつ剛毛５は長さ“Ｃ”においてプラスティック融液によって包囲されルが、融液が多孔プレート２の剛毛束通路内へ侵入することはない。剛毛支持体ないしはブラシのハンドルが十分に冷却されると、多孔プレート１，２および締付けプレート４から成るカセットが引離され、金型半部１０が持上げられ、かつ仕上げブラシ１４が取出される。
図６ａによる実施例では多孔プレート２は金型フレーム内へ突出する同心的なカラー１５を有している。剛毛５が同様にして図１ａに関して記載されたように多孔プレート１，２および開いた位置の締付けプレート４内へ導入される。多孔プレート２から突出した剛毛端部が加熱装置と成形装置とが組合された加熱兼成形装置１６を用いて溶融され、かつ融液がカラー１５の所で変形され、このようにして厚肉部７が形成される。厚肉部の直径“Ｄ”は溶融直後は剛毛束直径よりも若干大きく（図６ｂ）、変形により直径“Ｅ”に増径される。変形の後締付けプレート３を開き、剛毛５ないしは剛毛によって形成された剛毛束が、厚肉部７と多孔プレート２のカラー１５との間の距離が“Ｃ”（図３ｂ参照）になるまでスライダ１７によって金型キャビティの方向へ移動せしめられる（図７ｂ）．依然軟可塑性である厚肉部７の融液の変形は、依然軟可塑性である物質が熱処理によって弱体化された剛毛間へ並びに剛毛束の外周部に沿って剛毛の方向へ移動せしめられる（図８から図１０）ようにして実施することもできる。これによって剛毛５の熱で弱体化された長さの少なくとも１部分は剛毛自体の材料によって包囲される（図１０の領域１０に認められる）。
射出成形材料流れを回避し、かつ剛毛束取付け部の領域において剛毛支持体のプラスティック融液の迅速な冷却を達成するためには、金型半部ないしは多孔プレート２が剛毛束通路の領域に流路を延長する、同心的な輪郭部、例えばカラー１５（図８）または適切な凹所１９を有していてよく、この場合凹所の底部に剛毛束通路が始まる。The invention relates to a method according to the superordinate concept of claim 1 and to a bristle product according to the superordinate concept of claim 10.
Since the use of plastics in both bristle products and bristle supports in bristle products, the functional binding of bristle bundles to conventional bristle supports can be combined with a shape without using another functional fastening means or Attempts have been made to replace material bonding. In particular, there is a so-called injection in which a plastic melt for bristle support is ejected and embedded around the ends of the bristle bundle and fixed to the bristle support.
An important quality characteristic of bristle products is the pullout strength of the individual bristle or bristle bundle, i.e. the bristle must be embedded in the plastic material of the bristle support so that it does not separate under forces acting in use. Accordingly, in the known injection molding method, a thick wall portion is provided at the end of the bristle bundle placed in the injection mold, and this thick wall portion is used for the injection of the bristle support to the periphery with the plastic material. Later, a kind of anchor is formed, and the bristles are connected to each other at their fixed ends, so that a pulling force acting on the bristle bundle or only on the individual bristles is guided into the thick part and supported by the bristle Only those that are absorbed by Einspannung in the body proved useful.
The known method uses all injection molds, one of the mold halves is provided with a number of passages corresponding to bristle grafts, the bristle bundles within the passages and the ends of the molds. It can be supplied until it enters the cavity. The bristle ends of the bristle bundle are then joined together by an adhesive forming a thick part (French Patent No. 1453829 / Piotrowski) or melted if the bristle is made of plastic monofilament, It hardens and becomes a thick part having a cross section larger than the bristle bundle (Germany 859933 / Schiffer).
It is clear that the pullout strength of the bristles increases as the length of the bristle bundle embedded in the bristle support body increases. However, this is contrary to the following requirements: The amount of material used must be kept as low as possible, whether it is a bristle or a bristle support, usually made of an expensive plastic, eg polyamide, which corresponds to the bristle. Realized by short and fixed. In addition, there are bristle products in which the bristle support must be as thin as possible for reasons of use. This applies, for example, to a toothbrush to ensure the shortest possible configuration, including the length of the bristles, due to the narrow situation in the oral cavity.
In a known method, the fixed length of the bristle is minimized by injecting the thick portion obtained by melting the bristle end into the opening of the passage for guiding the plastic melt of the bristle support to the bristle bundle. The plastic of the bristle support which is pushed away by pressure, thus actually reducing the fixing length to the thickness of the thick part, and the bristle bundle sticking exclusively between the thick part and the mold wall Obtained by achieving with material (European Patent 042885 / Anchor). Simultaneously with this known method, the injected plastic melt with the passage sealed at the thick wall part flows along the edge of the bristle bundle or between the bristle (injection molding material flow Ueberspritzen), and can be applied to the finishing brush. The goal is to stop or at least detract from aesthetics. This will also affect the bending behavior of the bristles in the region of attachment to the bristle support in an irregular manner. However, this method is inadequate for a number of reasons. First, pressing of the thick part to the bristle bundle passage is not reliable and cannot be guaranteed to be reproducible. That is, by guiding the injection molding material in the mold, the cross section of the thick part, particularly the length thereof protrudes beyond the diameter of the bristle bundle, so that the thick part also floats in the melt. In some cases, it may be drawn into the melt from the passage, so that a sealing effect cannot be obtained, and a uniform use length cannot be obtained outside the bristle support. The pull-out strength of the bristle bundle is not sufficient because the thin material web that covers the thick part has only moderate shear strength.
The disadvantages of this method have been partially eliminated by other known methods, i.e. by applying tension to the bristle bundle so that the thick portion is formed and sealed against the passage opening after the thick portion is formed. (European Patent 0326634 / Coronet). In this way, as short as possible and the same embedment length is obtained for all bristle bundles, and so-called injection molding material flow (intrusion into the path of plastic material and between bristle bundles and into the outer periphery of the bristle bundle) occurs. Not. However, the medium shear strength in fixing the thick part remains the same.
In another known method (Germany 1050304 / Beck), the injection molding material flow is a single pack with all the bristle of the bristle product implant combined and a plate is integrally molded at the fixed end Only the edges of the plate are avoided by being engaged from below by the bristle carrier plastic material. This configuration may be advantageous for brushes, paintbrushes or the like where importance is not placed on the action of multiple small bristle bundles. That is, this method is limited to special bristle products. Furthermore, in this case too, the cross section that can be used for the purpose of anchoring is very small, so that its shear strength is not sufficient for normal stress.
Known methods (European Patent 042885 and European Patent 0326634) with which the best results can be expected show that the bristle products produced thereby, in particular toothbrushes, have other unexpected quality defects in addition to the described defects. It was. That is, after a certain period of time at the latest, the bristle bundle spreads and the bristle's resilience significantly deteriorates, i.e., the bending strength of the individual bristle is clearly reduced by this method, which is the case with a larger buried length configuration. unacceptable. However, in this case (Germany 845993, France 14538829) there are other disadvantageous effects in addition to the disadvantageous high material usage. For example, in some cases, the bristles are not parallel to each other after release, or are not perpendicular to the fixed surface of the bristle support, are inclined with respect to a predetermined position, or bent in the region where the bristles are embedded It was shown that
Larger buried lengths, which are advantageous for use, must avoid injection molding material flow and the resulting flash formation. For this purpose, a sealing means has already been proposed in this method. For example, a mandrel is driven into a bristle bundle in the passage to press the bristle closely in the passage (Germany 3832520 / Schiffer). Another method (Germany 2922877 / Zahoransky) narrows the passage on the cavity side of the mold and pushes the bristle bundle into this part. Moreover, the passage is loaded with compressed air from the outside.
In all known methods with additional sealing means, even if these give the desired large fixed length, the product still has quality defects. Within the bristle bundle attachment area on the bristle support surface, injection molding material flow and, in particular, material peaks, crevices and recesses and the resulting irregularities in the shape of the flashes and edges were shown. The cross section optionally showed cavities. These surface defects are particularly disadvantageous with toothbrushes (due to the possibility of damaging mucous membranes) and body brushes. Toothbrushes or body brushes with this drawback do not meet the hygienic requirements, because undesired deposition occurs, in particular bacterial growth and proliferation. Finally, this also reduces the pullout strength.
The object of the present invention is to achieve the method according to the superordinate concept of claim 1 with sufficient pulling strength of the bristle bundle or individual bristles with as little material usage as possible, while maintaining the bending elasticity and recovery capability of the bristles. And an improvement to obtain a satisfactory surface in the attachment area of the bristle support. Furthermore, bristle products that meet these requirements must be provided.
The present invention starts from the known knowledge that the bending strength and bending elasticity (recovery ability) of the bristles obtained by monofilament stretching and thermal stabilization are impaired by melting of the bristle ends to form thick parts To do. Molecular reorientation occurs in the bristle attachment region closest to the thick-walled portion, which in turn degrades the bending behavior of the individual bristle and similarly decreases the tensile strength. The former causes expansion of bristle bundles in a known method in which a thick portion is sealed against the passage. The method according to the present invention embeds the bristle heat-weakened area with as little bristles and bristle support material usage as possible, so that the exposed portions of the bristles outside the bristle support are stretched and thermally stable. The properties obtained by the conversion are completely maintained. Since the weakened area is fixed, the pullout strength of the individual bristles is improved.
The length lost by heat due to the melting of the bristle bundle depends on several factors, in particular the high melting temperature and the duration of the heat, the type of plastic and monofilament. The actual length of damage can be confirmed without problems in individual bristle bundles by pre-testing with bristle bundle end melting and several alternating stresses and is therefore required for products manufactured by injection molding. The buried length can be confirmed.
As mentioned above, knowledge of the thermal damage of the bristles is known in another connection, namely in the welding of the bristles to the bristle support (German utility model 9206990 / Bickel). This is considered with a brush having a complicated structure in which a recess is provided on the bristle side of the brush body. The bristles are welded onto a thin plastic plate. The plastic plate is inserted into the recess and covered by a perforated plate through which the bristle bundle passes. The bristle bundle is supported laterally within the holes in the plate.
In order to support the last porous plate and the bristle bundle plate with the brush body, separate members are required. Such brushes cannot be manufactured at an acceptable cost, and toothbrushes or body brushes cannot meet the physiological and hygienic requirements because of the edges and gaps. This also fails to solve the pullout strength problem of individual bristles.
In the method according to the invention, the thermally damaged area is buried by enclosing it exclusively with the plastic of the bristle support. The buried length of the bristle bundle is defined by the distance from the passage opening of the thick part. However, this distance has to meet another condition according to the invention; that is, this distance is at least air displaced in the cavity during the injection process (which is preferably a recess, a gap, etc., and therefore advantageously Must also be sized so that it can also move behind the thick part of the bristle bundle) through the passageway and possibly also between the bristle. This is because it seems to be related to the observed cavities, voids, etc. in the bundle mounting part. The same applies to the optional degassing product of the melt (“Kunststoff-Lexikon” 6th edition, Carl Hanser Verlag). The disadvantage according to the invention is also eliminated. On the other hand, the distance between the thick part and the passage opening must not be so great that injection molding material flow occurs. An important parameter for measuring the smallest possible distance is determined by the present invention, i.e. avoiding embedding of thermally weakened length regions, cavities, voids etc. of bristles and avoiding injection molding material flow Perfect exhaust consideration of the mold in the buried area to achieve a smooth surface in the bristle support. In this case, it has been observed that the present invention eliminates the need to seal the bristle bundle passages, which is particularly required in recent injection molding techniques.
In a normal bristle product, the parameters described by the present invention are such that the bristle bundle is positioned and fixed in the passage so that the distance between the thick section and the passage opening is two to five times the bristle diameter. It has been shown by field trials that This is numerically up to a distance of 0.1 to 1.0 mm, preferably up to 0.4 mm for bristle diameters up to 0.3 mm, and up to 0.5 to 2.0 mm, preferably up to 1.5 mm for larger diameters. Can be defined to be set.
In order to ensure mold evacuation on the one hand and to avoid injection molding material flow on the other hand, according to an embodiment, the cross-section of the passage through which the bristle cross-section of one bristle bundle guides the bristle bundle A bristle bundle is used that is 50-75%.
In this configuration, the capillaries between the bristles on the one hand and between the bristles and the passage walls on the other hand are large enough to allow for a perfect evacuation of the mold, especially in the area of the undercut present in the thick section, On the other hand, plastic melts (plastic melts are bristled by appropriate technical means (guides and controls for cooling the mold for injection molding, selection of materials in the region of the bristle bundle passage, guidance for injection speed and pressure, etc.). Narrow enough to prevent entry into the bristle capillaries or passages (which are cured as quickly as possible in the bundle attachment area).
The parameters to be maintained according to the invention can be determined by other actual quantities, i.e. the bristle bundle in the passage and the distance between the thick part and the passage opening being 20-50% of the diameter of the passage. In this case, the filling degree of the passages mentioned in the above embodiment must also be realized.
In carrying out the method in practice, the bristle bundle is inserted into the passage until its end is at a distance “A” from the passage opening and subsequently melted to obtain a length “L” <“A”. To. As a result, the thick portion is at a distance “B” from the opening of the passage, and the bristle bundle continues to be pulled back into the passage until the thick portion reaches the desired distance “C” <“B” from the opening of the passage.
In this way, the smallest possible distance can be adjusted particularly easily and accurately. In principle, a path for guiding the bristle bundle can be provided directly in one half of the injection mold, and the injection mold can be opened to form a thick wall at the bristle bundle end. It is. However, advantageously, outside the injection mold, the bristle bundle in the holding member provided with the passage is melted at the end to be thickened and positioned, and the bristle in which the holding member is subsequently positioned. This is done in such a way that it is hermetically bonded to the injection mold together with the bundle under the mold half. This method has the advantage that the preparatory work on the bristle bundle is performed outside the mold, not in an injection mold where it is heated in a continuous operation. Firstly, bristle damage due to radiation of the injection mold is avoided, while rapid curing of the plastic melt in the region of the bristle bundle end and holding member is taken into account, thus preventing injection molding material flow. The
This method can be further optimized by cooling the holding member on and from the injection mold to the mold and optionally cooling the bristle bundle after forming the thick section, thereby The bristle bundle and the holding member can always be kept at a constant and low controllable temperature and can be supplied to the injection mold in this state.
The subject of the present invention is that in the method mentioned at the outset, the still-soft-plastic substance that forms the bristle bundle end after melting is oriented in the direction of the bristle, the substance between the bristle and along the circumference of the bristle bundle. It can also be solved by deforming the bristles so as to surround at least a portion of the length range that is thermally weakened by molecular reorientation during monofilament melting.
In this way, at least a part of the weakened length range of the bristles is buried and stabilized by the bristle material directly by deformation of the still plastic thick part. As a result, the total embedment length of the bristle bundle and the thick portion can be further minimized.
This method also allows one part of the monofilament length region weakened by molecular reorientation during melting of the monofilament to be partly injected by the molten monofilament material that was displaced during the molding of the thick section. Pass the bristle bundle to the extent that the thick wall portion is surrounded by the plastic melt of the bristle support and the thick wall portion has a distance from the passage opening after the formation and deformation of the thick wall portion so that the plastic melt does not enter the passage. It can be changed to guide the insertion.
The length of the bristles surrounded by the displaced material in the thick wall is designed in this way so that the desired exhaust is provided in the region of the bristle bundle through the passage or the flow of injection molding material is avoided. It only has to be done.
The perfect evacuation of the mold cavity, particularly in the region of the bristle bundle attachment, and the avoidance of injection molding material flow, according to another embodiment, is that the injection speed is increased from the maximum value at the start of injection to that of the injection mold. It is supported by lowering the pressure to full filling and increasing the pressure from the original low value to a higher value after it is normally applied.
The means considered in another configuration of the invention work in the same way, i.e. the mold half with the passage has a concentric contour for this passage in the open area of the passage, and this contour Slows the flow rate by extending the flow path of the plastic melt in the region between the thick wall and the passage opening, and accelerates the cooling of the plastic melt in this region.
The extension of the flow path in the region of the bristle bundle is structurally formed by the contour being formed by a collar extending the passage into the mold cavity or by the recess in the mold wall. And is achieved by the presence of a passage opening at the bottom of the recess.
Not only can the top quality products (especially toothbrushes) be produced with the lowest defect rate by the method according to the invention, but it is also possible to use injection molding, which is well known in the art. Gives top quality brushes for general surface properties. Thus, for example, a toothbrush can be injection molded in the region of the end of the handle, which usually requires a high injection pressure in order to fill the mold cavity satisfactorily. This high injection pressure also results in a corresponding pressure increase of the air contained in the mold cavity, but this is completely eliminated by adjusting the distance between the thick wall and the passage opening edge according to the invention. Other exhaust means can be dispensed with, especially through the separation surface of the injection mold or through an additional exhaust passage, so that the injection mold is tightly closed. Therefore, no burrs are formed in the separation surface, and there are no additional molding points on the bristle support surface.
An object of the present invention is to provide a bristle product having the superordinate features of claim 16, wherein the thickened portion is between the bundle-side surface of the bristle support and the bristle thermally weakened when the monofilament is melted. This is solved by having a distance approximately corresponding to the length region.
In the following, embodiments of the method according to the invention will be described in detail with reference to the drawings. FIGS. 1 to 3 show the fabrication of thick parts, FIGS. 1a, 2a and 3a are schematic views of the necessary equipment, FIGS. 1b, 2b and 3b are enlarged views of the working range, and FIG. 4 is during injection. FIG. 6 and FIG. 7 show a modification of the method for manufacturing the thick portion, and FIG. 6 a and FIG. 7 a are necessary. FIGS. 6b and 7b are enlarged views of the working range, and FIGS. 8 to 10 are schematic views of other modifications of the method.
FIGS. 1 a to 3 a show two perforated plates 1, 2 which are arranged with two interstices between the bristle bundle cassettes, between which the clamping plates are movable in the direction indicated by arrow 3. 4 is arranged. The pattern of holes in the perforated plates 1 and 2 and the clamping plate corresponds to the arrangement of bristle bundles in the bristle transplantation region to be manufactured.
With the clamping plate 4 open, the bristles are introduced into the holes of the guide plates 1, 2 and the clamping plate 4 as a shortcut or in the form of bundles from endless strands until they protrude from the perforated plate 2 by a certain amount. Subsequently, the heating device 6 (FIG. 2a) is moved in front of the protruding end of the bristle bundle. The heating device heats the bristle end portion without contact and melts it, resulting in the formation of a thick portion (FIG. 2a). Subsequently, the clamping plate 4 is moved to the open position and the bundle is positioned by the slider 8 acting on the thick part 7, and then the clamping plate is moved to the closed position not shown.
It can be seen in the enlarged view of FIG. 1b that the bristles 5 protrude from the perforated plate by an amount “A” when supplying the bristle bundle. In the melting of the bristle end according to FIG. 2a, the bristle length “L” (FIG. 1b) shifts to the molten state, so that the thick part 7 formed at this time has a minimum distance “B” from the perforated plate 2. Have. The thick section 7 is then moved in the direction of the perforated plate 2 using the slider 8 (FIG. 3a) until it has the desired distance “C” (FIG. 3b) from the surface of the perforated plate.
The bristle bundle thus fixed is then coupled to the mold half 10 of the injection mold 11 using the cassette formed by the perforated plates 1 and 2 and the clamping plate 4 and using the centering member 9. The The cassette closes the mold nest of the mold half 10. After closing the mold by the second mold half 12, the plastic melt for the bristle support is ejected using the ejection head 13. The plastic melt surrounds the ends of the bristle bundles that have entered the mold cavity, i.e. the thick part 7 and the length "C" of the bristle (Fig. 3b). The pushed air passes through the holes of the perforated plate 2 forming the bristle bundle passage, and the bristles 5 are surrounded by the plastic melt in the length “C”. There is no entry into the passage. When the bristle support or brush handle is sufficiently cooled, the cassette comprising the perforated plates 1, 2 and the clamping plate 4 is pulled apart, the mold half 10 is lifted, and the finishing brush 14 is removed.
In the embodiment according to FIG. 6a, the perforated plate 2 has a concentric collar 15 protruding into the mold frame. The bristles 5 are likewise introduced into the perforated plates 1, 2 and the clamping plate 4 in the open position as described with respect to FIG. 1a. The bristle end protruding from the perforated plate 2 is melted by using a heating and molding device 16 in which a heating device and a molding device are combined, and the melt is deformed at the collar 15, and thus the thick portion 7 is formed. The diameter “D” of the thick part is slightly larger than the bristle bundle diameter immediately after melting (FIG. 6 b), and is increased to the diameter “E” by deformation. After the deformation, the clamping plate 3 is opened, and the bristle 5 or the bristle bundle formed by the bristle is a slider until the distance between the thick portion 7 and the collar 15 of the perforated plate 2 becomes “C” (see FIG. 3 b). 17 is moved in the direction of the mold cavity (FIG. 7b). The deformation of the melt in the thick-walled portion 7 that is still plastic is moved between the bristles weakened by the heat treatment of the still plastic material and in the direction of the bristles along the outer periphery of the bristle bundle (FIG. 8 to FIG. 10). This causes at least a part of the heat weakened length of the bristles 5 to be surrounded by the material of the bristles themselves (recognized in region 10 in FIG. 10).
In order to avoid injection molding material flow and to achieve rapid cooling of the bristle support plastic melt in the region of the bristle bundle attachment, the mold half or perforated plate 2 flows in the region of the bristle bundle passage. It may have a concentric contour, for example a collar 15 (FIG. 8) or a suitable recess 19 that extends the path, in which case the bristle bundle passage begins at the bottom of the recess.

Claims (17)

プラスティック製の剛毛支持体と、該剛毛支持体に固定された、延伸されかつ安定化されたプラスティックモノフィラメントから成る少なくとも１つの剛毛束とから成る剛毛製品を製造するための方法であって、剛毛支持体のための射出成形用金型の金型半部の通路内に剛毛束を案内し、射出成形用金型が閉じた場合に射出成形用金型の金型キャビティ内へ突出することになる剛毛端部に溶融して、前記通路の開口から距離をおいて配置された、剛毛束の横断面又は剛毛束のグループの横断面よりも大きな横断面を持つ厚肉部としかつ射出成形用金型を閉鎖しかつ剛毛支持体のためのプラスティック融液を金型キャビティ内へ射出した後に剛毛束が剛毛支持体内に植設される形式の方法において、剛毛束の厚肉部と前記通路の開口との間の前記距離を、一方では金型キャビティ内へのプラスティック融液の射出に際して押し除けられた空気および場合によりプラスティック融液から発生する脱気生成物が前記通路を通って排出されるように、他方では少なくとも、モノフィラメントの溶融の際に熱的な分子の戻り配向によって弱化されたモノフィラメントの長さ領域が前記プラスティック融液によって包囲され、しかも該プラスティック融液が前記通路内へ侵入することがないように調節することを特徴とする、剛毛製品を製造する方法。A method for producing a bristle product comprising a plastic bristle support and at least one bristle bundle of stretched and stabilized plastic monofilaments fixed to the bristle support, comprising: The bristle bundle is guided into the passage of the mold half of the injection mold for the body, and when the injection mold is closed, it will protrude into the mold cavity of the injection mold. A thick-walled part having a larger cross-section than the cross-section of the bristle bundle or the group of bristle bundles, which is melted at the bristle end and arranged at a distance from the opening of the passage, and the injection mold In a method in which the bristle bundle is implanted in the bristle support after closing the mold and injecting the plastic melt for the bristle support into the mold cavity, the thick part of the bristle bundle and the opening of the passage Before At least on the other hand, so that the air pushed off during the injection of the plastic melt into the mold cavity and possibly degassed products generated from the plastic melt are discharged through the passage. The length of the monofilament weakened by the thermal molecular return orientation during the melting of the monofilament is surrounded by the plastic melt and is adjusted so that the plastic melt does not enter the passage. A method for producing a bristle product, characterized in that: 前記通路の開口からの前記厚肉部の距離が剛毛の直径の２倍〜５倍になるように剛毛束を前記通路内で、位置決めしかつ固定する。請求項１記載の方法。The bristle bundle is positioned and fixed in the passage so that the distance of the thick part from the opening of the passage is twice to five times the diameter of the bristle. The method of claim 1. 前記通路の開口からの前記厚肉部の距離が剛毛の直径に関連して０．１〜２．０ｍｍになるように剛毛束を前記通路内で位置決めしかつ固定する、請求項１または２記載の方法。The bristle bundle is positioned and fixed in the passage so that the distance of the thick part from the opening of the passage is 0.1 to 2.0 mm in relation to the diameter of the bristle. the method of. 前記通路の開口からの前記厚肉部の距離を、０．３ｍｍまでの剛毛直径では０．１〜１．０ｍｍにかつより大きい直径では０．５〜２．０ｍｍに調節する、請求項３記載の方法。The distance of the thick part from the opening of the passage is adjusted to 0.1-1.0 mm for bristle diameters up to 0.3 mm and 0.5-2.0 mm for larger diameters. the method of. 剛毛束を前記通路内において、前記厚肉部と前記通路の開口との間の距離が前記通路の直径の２０〜５０％の範囲となるように位置決めしかつ固定する、請求項１から４までのいずれか１項記載の方法。The bristle bundle is positioned and fixed in the passage so that the distance between the thick portion and the opening of the passage is in a range of 20 to 50% of the diameter of the passage. The method of any one of these. １つの剛毛束の剛毛の横断面の合計がこの剛毛束を案内する前記通路の横断面の６０〜７５％となる剛毛束を使用する、請求項１から５までのいずれか１項記載の方法。6. The method according to claim 1, wherein a bristle bundle is used in which the bristle cross-section of one bristle bundle is 60 to 75% of the cross-section of the passage guiding the bristle bundle. . 剛毛束の端部が前記通路の開口との間に距離“Ａ”を有するまで剛毛束を前記通路内へ挿入案内し、次いで長さ“Ｌ”＜“Ａ”の長さを溶融し、前記厚肉部が前記通路の開口との間に距離“Ｂ”を有するようにし、次いで前記厚肉部が前記通路の開口から所望の距離“Ｃ”＜“Ｂ”を有するようになるまで剛毛束を前記通路内へ引戻す、請求項１から６までのいずれか１項記載の方法。Inserting the bristle bundle into the passage until the end of the bristle bundle has a distance “A” between the opening of the passage and then melting the length “L” <“A”, The bristle bundle is made to have a distance “B” between the thick part and the opening of the passage, and then until the thick part has a desired distance “C” <“B” from the opening of the passage. 7. A method according to any one of claims 1 to 6, wherein the process is withdrawn back into the passage. 前記通路を備えた保持部材内で剛毛束の端部を射出成形用金型の外部で溶融して厚肉部としかつ位置決めし、次いで前記保持部材を位置決めされた剛毛束と一緒に、一方の金型半部を補完しシール下で射出成形用金型に結合する、請求項１から７までのいずれか１項記載の方法。The ends of the bristle bundle are melted outside the injection mold in the holding member having the passage to form a thick wall part, and the holding member is then moved together with the positioned bristle bundle to 8. A method according to any one of claims 1 to 7, wherein the mold halves are complemented and joined to the injection mold under seal. 前記保持部材を射出成形用金型からのおよび射出成形用金型への搬送路上において冷却する、請求項８記載の方法。The method according to claim 8, wherein the holding member is cooled on a conveyance path from the injection mold to the injection mold. 剛毛束端部の溶融後形成されるまだ軟可塑性である物質を、該物質が剛毛間へかつ剛毛の外周部に沿って押しのけられかつモノフィラメントの溶融時に分子の戻り配向によって熱的に弱化された長さ領域の少なくとも一部分において剛毛を包囲するように剛毛の方向に変形する、請求項１から９までのいずれか１項記載の方法。The material that is still soft plastic formed after melting the ends of the bristle bundle is pushed away between the bristles and along the outer periphery of the bristle and is thermally weakened by the molecular return orientation when the monofilament melts at least deformed in the direction of the bristles so as to surround the bristles in part, any one process of claim 1 to 9 in the length field. 前記厚肉部の形成および変形後に、前記厚肉部が前記通路の開口との間に、モノフィラメントの溶融時に分子の戻り配向によって弱化されたモノフィラメントの長さ領域が、一部は前記厚肉部の変形によって押しのけられたモノフィラメントからの溶融物質によって、一部は射出された剛毛支持体のプラスティック融液によって包囲され、しかもプラスティック融液が前記通路内へ侵入しないような距離を持つようになるまで、剛毛束を前記通路内へ挿入案内する、請求項１から１０までのいずれか１項記載の方法。After the formation and deformation of the thick part, the length region of the monofilament weakened by the molecular return orientation when the monofilament is melted between the thick part and the opening of the passage, partly the thick part The molten material from the monofilament displaced by the deformation of the material is partially surrounded by the injected bristle support plastic melt until it has a distance that prevents the plastic melt from entering the passage. 11. A method according to any one of claims 1 to 10, wherein a bristle bundle is inserted and guided into the passage. 射出速度を射出開始時の最大値から射出成形用金型が完全に充填されるまで低下せしめかつ通常適用される後圧力を最初の低い値からより高い値へ上昇せしめる、請求項１から１１までのいずれか１項記載の方法。12. The injection speed is reduced from the maximum value at the start of injection until the injection mold is completely filled and the normally applied post pressure is increased from the first low value to a higher value. The method of any one of these. 前記通路を備えた金型半部が前記通路の開口の領域内に前記通路に対して同心的な輪郭部を有しており、該輪郭部が前記厚肉部と前記通路の開口との間の領域内にてプラスティック融液の流路の延長によってプラスティック融液の流れ速度の遅延を行いかつこの領域内でのプラスティック融液の冷却を加速する、請求項１から１２までのいずれか１項記載の方法。The mold half provided with the passage has a concentric contour with respect to the passage in the region of the opening of the passage, and the contour portion is between the thick portion and the opening of the passage. The flow rate of the plastic melt is delayed by extending the flow path of the plastic melt in the region, and the cooling of the plastic melt in the region is accelerated. The method described. 前記輪郭部が前記通路を金型キャビティの方向に延長するカラーによって構成されている、請求項１３記載の方法。14. A method according to claim 13, wherein the contour is constituted by a collar extending the passage in the direction of the mold cavity. 前記輪郭部が金型壁内の凹所によって形成されておりかつ前記通路の開口が前記凹所の底部に存在する、請求項１３記載の方法。The method of claim 13, wherein the contour is formed by a recess in the mold wall and the opening of the passage is at the bottom of the recess. 前記通路の開口からの前記厚肉部の距離を、０．３ｍｍまでの剛毛直径では０．４ｍｍまでにかつより大きい直径では１．５ｍｍまでに調節する、請求項４記載の方法。5. The method of claim 4, wherein the distance of the thick section from the opening of the passage is adjusted to 0.4 mm for bristle diameters up to 0.3 mm and 1.5 mm for larger diameters. 射出成形用金型からのおよび射出成形用金型への搬送路上において前記保持体をかつ厚肉部形成後に剛毛束を冷却する、請求項８記載の方法。The method according to claim 8, wherein the bristle bundle is cooled after forming the thick body and the holding body on the conveyance path from the injection mold to the injection mold.
JP52862095A 1994-05-05 1995-04-14 Method for producing bristle product by injection molding method and bristle product produced by this method Expired - Fee Related JP3813171B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4415886A DE4415886A1 (en) 1994-05-05 1994-05-05 Process for the production of bristle goods by injection molding
DE4415886.6 1994-05-05
PCT/EP1995/001408 WO1995030350A1 (en) 1994-05-05 1995-04-14 Process for the manufacture of brushes by injection moulding

Publications (2)

Publication Number Publication Date
JPH09512724A JPH09512724A (en) 1997-12-22
JP3813171B2 true JP3813171B2 (en) 2006-08-23

Family

ID=6517382

Family Applications (1)

Application Number Title Priority Date Filing Date
JP52862095A Expired - Fee Related JP3813171B2 (en) 1994-05-05 1995-04-14 Method for producing bristle product by injection molding method and bristle product produced by this method

Country Status (16)

Country Link
US (1) US5823633A (en)
EP (1) EP0759711B2 (en)
JP (1) JP3813171B2 (en)
CN (1) CN1101662C (en)
AT (1) ATE170370T1 (en)
AU (1) AU684938B2 (en)
BR (1) BR9507609A (en)
DE (2) DE4415886A1 (en)
ES (1) ES2121625T5 (en)
FI (1) FI108396B (en)
NO (1) NO314826B1 (en)
RU (1) RU2139670C1 (en)
TW (1) TW299279B (en)
UA (1) UA44893C2 (en)
WO (1) WO1995030350A1 (en)
ZA (1) ZA953302B (en)

Families Citing this family (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9524580D0 (en) * 1995-12-01 1996-01-31 Unilever Plc A toothbrush with flexibly mounted bristles
GB9620092D0 (en) * 1996-09-26 1996-11-13 Unilever Plc A brush and method for producing same
HU223145B1 (en) 1997-02-14 2004-03-29 Smithkline Beecham Consumer Healthcare Gmbh. Injection moulding process and apparatus for making articles from two components
GB9703274D0 (en) * 1997-02-17 1997-04-09 Unilever Plc A toothbrush with flexibly mounted bristles
DE19745919C1 (en) * 1997-10-17 1999-08-12 Minnesota Mining & Mfg Injection mold for the encapsulation of plastic around a filter material, filter for filtering fluids and method for producing such a filter
DE19853030A1 (en) 1998-11-18 2000-05-25 Coronet Werke Gmbh Process for the production of bristle goods and device for carrying out the process
EP1181144B1 (en) * 1999-06-02 2004-01-07 M + C Schiffer GmbH Method and device for producing brushes
US6439669B1 (en) 1999-08-31 2002-08-27 Gillette Canada Company Filament gripper
US6260928B1 (en) * 1999-12-15 2001-07-17 Moll Industries, Inc. Handle Configuration for brush production by fusion
DE19962188A1 (en) 1999-12-22 2001-09-06 Schiffer Fa M & C Process for producing a brush head by injection molding
US6523907B1 (en) 2000-02-01 2003-02-25 Moll Industries, Inc. Apparatus and method for producing brushware by injection molding
US6553604B1 (en) 2000-03-16 2003-04-29 Gillette Canada Company Toothbrush
US6588851B1 (en) * 2000-05-26 2003-07-08 Kenan Bible Clamp for retaining bristle bundles of various sizes
US6893100B1 (en) 2000-09-19 2005-05-17 Gillett Canada Company Methods and apparatus for automated brush assembly
DE10123258A1 (en) * 2001-05-12 2002-11-21 Braun Gmbh toothbrush head
US6578929B2 (en) * 2001-05-23 2003-06-17 The Gillette Company Tufting oral brushes
DE10244499A1 (en) * 2002-09-25 2004-04-15 Braun Gmbh Bristle product, in particular, in the form of a toothbrush with a plurality of bristle tufts comprises columns which are formed of molten bristles and have roughly same cross sections as the bristle tufts
AR043336A1 (en) 2003-01-20 2005-07-27 Glaxosmithkline Consumer Healt TOOTHBRUSH HEAD WITH TRIANGULAR PIGS AND WAVES
US20040177462A1 (en) 2003-03-14 2004-09-16 The Gillette Company Toothbrush head
US20060272112A9 (en) 2003-03-14 2006-12-07 The Gillette Company Toothbrush
ES2424942T3 (en) * 2003-04-22 2013-10-10 Trisa Holding Ag Brush head for an electric toothbrush
US7941886B2 (en) 2003-09-19 2011-05-17 Braun Gmbh Toothbrushes
US7275277B2 (en) * 2003-09-26 2007-10-02 Colgate-Palmolive Company Flexible toothbrush head
DE102004020713B4 (en) * 2004-04-26 2007-10-04 Beiersdorf Ag Brush for cosmetic products and process for its preparation
EP1593321B1 (en) 2004-05-07 2007-01-24 GlaxoSmithKline Consumer Healthcare GmbH &amp; Co KG Brush head
US8042217B2 (en) 2004-11-02 2011-10-25 Colgate-Palmolive Company Toothbrush and method of making the same
DE102004058980A1 (en) * 2004-12-06 2006-06-08 Beiersdorf Ag Applicator for liquid or pasty media, in particular decorative cosmetics such as mascara
US7677675B2 (en) * 2005-10-24 2010-03-16 United Rotary Brush Corporation Method and apparatus for making brushes
DE102006019706A1 (en) * 2006-04-27 2007-10-31 Osborn International Gmbh Brush particularly strip brush, has brush body and multiple bristles held in body, where brush is casting mass, which is flexibly hardened and casting mass is a two component casting resin particularly polyurethane resin
DE102007059016A1 (en) * 2007-12-06 2009-06-10 Braun Gmbh Processing of bristles
DE102009053663A1 (en) 2009-11-17 2011-05-19 Zahoransky Ag Method for production of bristle goods in anchorless manner, involves connecting bristle bundle to compact unit at attachment side end, where calibrated bundle doll is inserted into bundle body
DE102011017099A1 (en) 2011-04-14 2012-10-18 M + C Schiffer Gmbh Method for manufacturing brush e.g. toothbrush, involves extending thick portion of brush bundle during injection molding of plastic material against several support elements distributed around bundle circumference
EP2534973B1 (en) * 2011-06-15 2015-04-08 Braun GmbH Method and tool for producing a brush head
BR112014001099A2 (en) 2011-07-23 2017-02-14 Braun Gmbh mouthwash having a plastic clamp comprising a cavity
DE102012013638A1 (en) 2012-07-09 2014-01-09 M + C Schiffer Gmbh Bristle commodity manufacturing method, involves peripherally clamping bristle element between set of jaws during encapsulation, and providing bristle element and filament carrier in bristle commodity
US20150097309A1 (en) * 2013-10-04 2015-04-09 The Procter & Gamble Company Process and apparatus for making tufted article
TWI539911B (en) * 2013-11-29 2016-07-01 Cheng Fang Integral molded seamless brush and its manufacturing method
EP2886009B1 (en) * 2013-12-18 2019-01-30 The Gillette Company LLC Device for fusing the ends of thermoplastic filaments and corresponding method
EP3138437B1 (en) 2015-09-03 2021-11-10 Braun GmbH Method of manufacturing a brush
CN105433590A (en) * 2015-12-02 2016-03-30 上海力玛赫机电制造有限公司 Device and method for connecting brush hair with handle and brush made through device
US10646031B2 (en) 2016-04-08 2020-05-12 M+C Schiffer Gmbh Feeding device for feeding batches of bristle filaments to a bristle filament cassette
CN110868890A (en) 2017-07-12 2020-03-06 皇家飞利浦有限公司 Brush head arrangement
DE102017119588A1 (en) 2017-08-25 2019-02-28 Vorwerk & Co. Interholding Gmbh Sweeping brush for a self-propelled cleaning device
EP3753447A1 (en) 2019-06-21 2020-12-23 The Procter & Gamble Company Method for producing a toothbrush head or a part thereof

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1050304B (en) *
US2643158A (en) † 1947-06-25 1953-06-23 Columbia Protektosite Co Inc Method of making molded brushes
DE845933C (en) * 1949-07-28 1953-06-11 Maximilian Schiffer Method and machine for producing brushes, in particular toothbrushes
FR1462272A (en) * 1965-09-03 1966-04-15 Method for manufacturing brushes, device for carrying out this method and resulting brush
FR1453829A (en) * 1965-03-05 1966-07-22 Method of manufacturing brushes and the like
DE2922877A1 (en) * 1979-06-06 1980-12-18 Zahoransky Anton Fa Brush manufacturing system using injection-moulded brush bodies - sets tuft ends in openings in mould using sealing means
EP0142885B1 (en) * 1983-11-16 1991-02-06 Anchor Advanced Products, Inc. Process for making a brush with self retention of bristles and brush made by the process
US4635313A (en) * 1983-11-16 1987-01-13 North American Philips Corporation Brush with self retaining bristles
EP0149996A3 (en) * 1984-01-10 1987-10-21 Schlesinger GmbH &amp; Co. Maschinenbau KG Method and machine for manufacturing brushes
DE3403341A1 (en) † 1984-02-01 1985-08-08 Coronet - Werke Heinrich Schlerf Gmbh, 6948 Wald-Michelbach METHOD FOR CONNECTING BRUSHES TO A BRUSH SUPPORT
DE3511528C1 (en) * 1985-03-29 1991-01-03 Coronet - Werke Heinrich Schlerf Gmbh, 6948 Wald-Michelbach Process for the production of bristle goods
DE3642124C2 (en) * 1986-12-10 1995-11-23 Coronet Werke Gmbh Process for the production of bristle goods and device for carrying out the process
DE3832520A1 (en) * 1988-09-24 1990-04-05 Schiffer Fa M & C Method and device for producing brushes, in particular brushes for hygiene requirements, such as toothbrushes
DE69018070T2 (en) * 1990-06-28 1995-08-10 Boucherie Nv G B Brush making machine.
DE9206990U1 (en) * 1992-05-23 1993-09-23 Bickel, Wolfgang, 64668 Rimbach RESOURCE-SAVING BRUSHES MADE OF PLASTIC
DE4311186A1 (en) * 1993-04-06 1994-10-13 Schiffer Fa M & C Method and device for producing brush goods
EP1181144B1 (en) † 1999-06-02 2004-01-07 M + C Schiffer GmbH Method and device for producing brushes
DE19962188A1 (en) † 1999-12-22 2001-09-06 Schiffer Fa M & C Process for producing a brush head by injection molding

Also Published As

Publication number Publication date
FI964069A (en) 1996-10-10
CN1147197A (en) 1997-04-09
US5823633A (en) 1998-10-20
ATE170370T1 (en) 1998-09-15
NO314826B1 (en) 2003-06-02
JPH09512724A (en) 1997-12-22
DE59503437D1 (en) 1998-10-08
NO964665D0 (en) 1996-11-05
FI108396B (en) 2002-01-31
ZA953302B (en) 1996-01-05
DE4415886A1 (en) 1995-11-09
BR9507609A (en) 1997-08-19
EP0759711B1 (en) 1998-09-02
CN1101662C (en) 2003-02-19
ES2121625T5 (en) 2005-11-16
EP0759711A1 (en) 1997-03-05
FI964069A0 (en) 1996-10-10
RU2139670C1 (en) 1999-10-20
NO964665L (en) 1996-11-05
AU684938B2 (en) 1998-01-08
AU2307795A (en) 1995-11-29
TW299279B (en) 1997-03-01
WO1995030350A1 (en) 1995-11-16
EP0759711B2 (en) 2005-05-11
UA44893C2 (en) 2002-03-15
ES2121625T3 (en) 1998-12-01

Similar Documents

Publication Publication Date Title
JP3813171B2 (en) Method for producing bristle product by injection molding method and bristle product produced by this method
JP4674034B2 (en) Method and apparatus for manufacturing brush products and brush products
JPS61268208A (en) Production of bristle product
JP4446882B2 (en) Method for producing bristle structures on a carrier
US5622411A (en) Process for joining bristle bundles to a plastic bristle carrier and apparatus for the same
AU674136B2 (en) Improved method of fastening bristle tufts to bristle carrier
JP2732875B2 (en) How to make bristle products
JP3459323B2 (en) Method and apparatus for manufacturing brush
CA2251929C (en) Method for the production of bristle goods
CA2183580C (en) Process for the manufacture of brushes by injection moulding
UA57612C2 (en) Method for making toothbrush and appliance for its implementation
JPH09220126A (en) Brush producing method
JPH0956475A (en) Brush and its manufacture
JPH0965933A (en) Brush manufacturing method
JPH1042956A (en) Brush
JPH1014664A (en) Manufacture of toothbrush
JPH0965932A (en) Manufacturing method of brush
JPH10257925A (en) Manufacture of brush
JPH0956479A (en) Brush and its manufacture
JPH0956478A (en) Brush and its manufacture
JPH09182629A (en) Manufacture of brush and its device
GB2308824A (en) Multi-cavity injection moulding

Legal Events

Date Code Title Description
A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20050201

A601 Written request for extension of time

Free format text: JAPANESE INTERMEDIATE CODE: A601

Effective date: 20050502

A602 Written permission of extension of time

Free format text: JAPANESE INTERMEDIATE CODE: A602

Effective date: 20050620

A313 Final decision of rejection without a dissenting response from the applicant

Free format text: JAPANESE INTERMEDIATE CODE: A313

Effective date: 20050912

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20051101

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20060227

A911 Transfer to examiner for re-examination before appeal (zenchi)

Free format text: JAPANESE INTERMEDIATE CODE: A911

Effective date: 20060316

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20060329

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20060406

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20060502

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20060531

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100609

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100609

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110609

Year of fee payment: 5

LAPS Cancellation because of no payment of annual fees